These go hand in hand correct? I am looking to rejet, but now my friend tells me that it will be tougher on the bike and i will lose performance if i dont get a new exhaust too. will a slip on do the job just as well as changing the whole exhaust (he isnt sure and neither am i)? he basically said that with the more thoroughput of the carbs you need a new pipe to handle it. or are we wrong? let me know, i want to increase some performance. would the cobra f1 suffice? also is it really loud cause i go into work at 6 in the morning and it will piss off the neighbors if it is loud when i am warming up the bike in the morning. thanks for the help. oh yea, two different pages on rejetting, one says 125 and the other says 127.5 for the mains, which should i get and which should i get if i decide to get this new pipe!
from starcycle:
89-98 GS500
F1R-3078R
F1R ALUM SLIP-ON
$147.95
89-98 GS500
S-3078
F1S ALUM SLIP-ON
$147.95
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I have a 2001 gs500, this can will still work?
The bike is already jetted lean from the factory, so you could rejet w/o an exhaust upgrade and see an improvement in performance. I need to do this still...
Upgrading the exhaust as well though isn't a bad idea. The stock headers are fine, in most people's opinions. So a slip-on is a good, cheap way to go.
You need: 40 pilots, 125 mains, and 2.5-3 turns out on the mixture screw for jetting a stock GS or a GS with an exhaust mod. Oh yea and 1 washer under the needle, don't remember washer size offhand.
An aftermarket exhaust will be louder, I drilled my stock pipe, and my neighbors don't complain, and I live in an apartment.
Quote from: ScottWVYou need: 40 pilots, 125 mains, and 2.5-3 turns out on the mixture screw for jetting a stock GS or a GS with an exhaust mod. Oh yea and 1 washer under the needle, don't remember washer size offhand.
He's got a 2001, so this doesn't apply - I don't think there's a decisive rejet formula for the 2001 + bikes yet.
There is. I've listed it on my site...saw it here in one of the older posts.
Well, how 'bout that.
They come stock with 17.5 bleed type pilots, a number 60 mid-jet and 127.5 main jets. The formunla seems to be -
STOCK - increase main jet one or two sizes, shim needle with a washer, pilot screws out to 3 turns (to start) - most of the cold bloodedness goes away. If it doesen't, then go up one on pilot.
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Crystal Clear Gravy here...
So I would get a main that is 128.5 or 129.5 and if i get the cobra exhaust i should probably go with the 129.5? second use #4 washers as described with all previous models for shimming the needled. i dont need new bleed type pilots or new mid-jets. and if the cold bloodedness doesnt go away turn the pilot 4 times instead of 3. finally, follow assembly and disassembly the same as what is described for all previous gs models. everything right?! i am just trying to get it all down because i have never done this stuff before. thanks all.
ALMOST RIGHT-
COLD BLOODEDNESS NEEDS TO BE ADDRESSES WITH INSTALLING NEW, BIGGER, PILOT JETS, NOT TURNING THE AIR MIXTURE SCREW OUT MORE. YOU'LL LIKELY NEED THEM AS WELL AS MAINS.
SORRY ALL CAPS.
so go up 1 or 2 on the pilot jets and make it the same number i go up on the main jets?
Quote from: chimivee...He's got a 2001, so this doesn't apply...
DOH!
Good catch... I wasn't paying attention :(
Well since the jeting is covered by them...(01 is a complete mystery to me) Slip on will work just like a full pipe. The headers are plenty big for a stock motor. I however would stay away from the cobra. why...simple for the same or less money you can get a much better can (I got some very good ones for ~$75) and get a muffler shop to do some minor adaptive type fitting (~$25-50 depending on the can) and the end result will look a lot better than the cobra. That is a rather cheesy and cheapo looking can. A Yosh even if its got scratches looks better and those are very common on ebay.
Cool.
Srinath.